That leaves returnee Sheryl Crow. Crow straddles the line between rock, pop and even a tinge of country (depending on how she mixes up her set list.)

With eight of the 10 slots filled, there are two remaining dates open.

Rather than try and predict who I think will fill the vacant slots, here are five artists I'd like to see headline Musikfest this year:

Pharrell Williams

This is kind of a long shot, but I would
be "Happy" to see Pharrell Williams take one of the spots. His feel-good hit "Happy"
is blowing up on the radio and I'm sure he could convince Chic guitarist Nile Rodgers to join him. Both
Williams and Rodgers lent their respective vocal and six-string talents to "Get Lucky," their Grammy
Award-winning collaboration with Daft Punk. Williams would be a great draw,
attracting a younger and contemporary audience. Williams is a man of many talents: he sings, he dances and he knows how to entertain, even if he enjoys wearing over-sized designer forest ranger hats.

Imagine Dragons with opening band Walk the Moon

They may be on top of the world, but alt-rockers Imagine Dragons would be right at home in Bethlehem on the Musikfest stage. The band relies on lots of energy in their live performance and with plenty of crowd-tailored sing-a-longs in their repertoire, including "It's Time," "On Top of the World" and "Radioactive," this would be a sweaty good time. Having up-and-comers Walk the Moon -- another dynamic live act -- kick off the show would make for a truly memorable night under the stars.

Collective Soul and Better Than Ezra

Alternative rockers
Collective Soul last headlined Musikfest in 2008. But then again, Sheryl Crow
is coming back after a two-year absence. Collective Soul is celebrating their 20th anniversary this year and a stop in Bethlehem should be on the itinerary. Booking them with fellow '90s hit-makers, post-grunge rockers Better Than Ezra, would make it even more special and it fills the hard rock void that in previous years has been taken up by such bands as Buckcherry and Skillet. Besides, Collective Soul singer Ed Roland and Better Than Ezra singer Kevin Griffin are already familiar with SteelStacks: The two men performed in 2011 at Musikfest Cafe during their "Southern Gentlemen" acoustic tour. There are no announced plans for the two groups to actually tour together, but it would be a more exciting nostalgia trip than the Summerland Tour.

LordeThe 16-year-old New Zealand singer is one of the hottest acts in the country, thanks to her massive radio hit "Royals." And she rocked Nirvana's "All Apologies" with the band's surviving members at the Rock and Roll Hall of Fame induction ceremony. Adding Lorde to the lineup would give Musikfest an added layer of cool.

Ed SheeranThe English singer-songwriter is stopping in early September in Philadelphia. But a swing through the Christmas City a few weeks earlier is not that far-fetched. Sheeran certainly has enough name recognition and crossover appeal to put butts in the seats at Musikfest. His toe-tapping ditties -- "The A Team" and "Lego House," among them -- are just the sort of relaxed summer evening listening the lineup needs. It doesn't hurt that he is an official ambassador for Upper Nazareth Township-based guitar manufacturer C.F. Martin & Co.